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  • Author or Editor: H. Kucharczyk x
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The eco-morphological adaptation of the pupal stages of some Polish Thripidae has been investigated in the laboratory. The propupa and pupa of species developing in grass inflorescences or in narrow cravices of leaf sheaths (Chirothrips pallidicornis, Iridothrips iridis) are characterized by shorter setae and smaller abdominal thorns than species developing on leaf blades or in flowers (Frankliniella tenuicornis, F. intonsa, Pezothrips dianthi, Thrips fulvipes, T. fuscipennis, T. menyanthidis, T. physapus, T roepkei, T. sambuci, T. simplex). Species feeding on monocots pupate and molt on their hosts as do the folicolous species feeding on dicots. In contrast, the floricolous ones feeding on dicots drop off the hosts and develop in the soil. Variation in the shape of the abdominal apical projection of the pupal stages of the female are described.

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Middle-eastern Poland is a region with the best-recognised fauna of thrips in comparison with the remaining area of the country. A list of threatened thrips species (Thysanoptera, Insecta) of this region is given with 44 species divided in five extinction-risk categories. The criteria used for classification into particular categories are based on data about frequency of species occurrence, area of occupancy, fragmentation of sites and presence of their host plants. One, Thorybothrips unicolor , was classified as critically endangered, eleven species as endangered, nine as vulnerable, fifteen as species of near threatened and eight belong to the least concern group. Most of the species occur on only one locality or have a fragmented distribution, their extinction is mainly a result of the disappearance of their host plants and habitat destruction. Nine species are also mentioned on red lists of the neighbouring countries the Czech Republic and Germany. Of these only Ankothrips niezabitowskii is threatened in all three countries, yet.

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Numerical analyses of ten species of larvae of the genus Thrips (angusticeps, atratus, fuscipennis, major, minutissimus, physapus, tabaci, trehernei, validus, vulgatissimus) and larvae of Taeniothrips picipes were performed using 24 qualitative morphological characters. Classification of OTUs was performed using Cluster Analysis and Correspondence Analysis, which form the measure between particular OTUs. The used analyses have proved that the most important features for distinguishing the taxa are connected with the sclerotisation of the head, thorax and the end of the abdomen as well as the sculpture of body parts.

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Several biometric characters for second larval instars of Haplothrips setiger, H. jasionis and H. statices collected in Poland have been analysed for the validity of species separation. Fourteen characters, mainly observed on tergites VIII and IX, were determined as significant in distinguishing the three taxa. Some qualitative characters were also analysed, e.g. degree of body sclerotization and shape of setal apices. The latter is the most important to distinguish these species. PCA and CA analyses have been used to find relationships.

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The work has determined the species composition as well as the number of thrips gathered on winter and spring wheat in milk-waxy ripe stage in six soil-climatic regions of Poland. The occurrence of 15 thrips species has been noted, nine of which were associated with cereals. They occurred most amply in south-western Poland. In all regions under study the following species were noted to exist in greater numbers: Frankliniella tenuicornis (Uzel), Limothrips denticornis Haliday and Haplothrips aculeatus (Fabricius). Limothrips cerealium Haliday was dominant in all western regions of Poland whereas Haplothrips tritici (Kurdjumov) in the south-eastern region.

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This first investigation of the Thysanoptera of the Babia Góra massif (Western Carpathians, Poland), carried out in 18 plant associations in five mountain belts, resulted in the collection of 64 species. By using a sweeping net 61 species were caught and by shaking flowering plants 53 species. The number of collected species decreased with altitude, from 62 in the lower forest belt to 21 in the alpine belt, as a result of the decreasing number of host plants and unfavorable abiotic factors. The proportion of graminicolous species increased from 22% in the foothills to 33% in the alpine zone (75% in Junco trifidi-Festucetum airoidis ). Four species characteristic of foothills and mountain areas were noted ( Oxythrips tatricus, Thrips trybomi, Haplothrips alpestris and H. alpicola ). O. tatricus was collected only on Pinus mugo in the sub-alpine belt and this was the second finding of this species in Poland.

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